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"Tesoro Detected Anomalies on North Dakota Line Before Spill"

"Tesoro Logistics LP detected anomalies during an inspection of its 20-year-old North Dakota pipeline just days before the line ruptured and spilled 20,600 barrels of oil onto farmland, the company said on Thursday."

"The six-inch pipeline was carrying Bakken oil to the Stampede rail facility outside Columbus, North Dakota, when it ruptured. A farmer harvesting wheat discovered oil spouting from the line on September 29.

A robot, known as a 'smart pig,' detected anomalies during what Tesoro called routine internal inspections of the pipeline September 10 and 11."